/**
the script only works on "input [type=text]"
**/
// don't declare anything out here in the global namespace
(function($) { // create private scope (inside you can use $ instead of jQuery)
// functions and vars declared here are effectively 'singletons'. there will be only a single
// instance of them. so this is a good place to declare any immutable items or stateless
// functions. for example:
var today = new Date(); // used in defaults
var months = 'Enero,Febrero,Marzo,Abril,Mayo,Junio,Julio,Agosto,Septiembre,Octubre,Noviembre,Diciembre'.split(',');
var monthlengths = '31,28,31,30,31,30,31,31,30,31,30,31'.split(',');
var dateRegEx = /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/;
var yearRegEx = /^\d{4,4}$/;
// next, declare the plugin function
$.fn.simpleDatepicker = function(options) {
// functions and vars declared here are created each time your plugn function is invoked
// you could probably refactor your 'build', 'load_month', etc, functions to be passed
// the DOM element from below
var opts = jQuery.extend({}, jQuery.fn.simpleDatepicker.defaults, options);
// replaces a date string with a date object in opts.startdate and opts.enddate, if one exists
// populates two new properties with a ready-to-use year: opts.startyear and opts.endyear
setupYearRange();
/** extracts and setup a valid year range from the opts object **/
function setupYearRange () {
var startyear, endyear;
if (opts.startdate.constructor == Date) {
startyear = opts.startdate.getFullYear();
} else if (opts.startdate) {
if (yearRegEx.test(opts.startdate)) {
startyear = opts.startdate;
} else if (dateRegEx.test(opts.startdate)) {
opts.startdate = new Date(opts.startdate);
startyear = opts.startdate.getFullYear();
} else {
startyear = today.getFullYear();
}
} else {
startyear = today.getFullYear();
}
opts.startyear = startyear;
if (opts.enddate.constructor == Date) {
endyear = opts.enddate.getFullYear();
} else if (opts.enddate) {
if (yearRegEx.test(opts.enddate)) {
endyear = opts.enddate;
} else if (dateRegEx.test(opts.enddate)) {
opts.enddate = new Date(opts.enddate);
endyear = opts.enddate.getFullYear();
} else {
endyear = today.getFullYear();
}
} else {
endyear = today.getFullYear();
}
opts.endyear = endyear;
}
/** HTML factory for the actual datepicker table element **/
// has to read the year range so it can setup the correct years in our HTML <select>
function newDatepickerHTML () {
var years = [];
// process year range into an array
for (var i = 0; i <= opts.endyear - opts.startyear; i ++) years[i] = opts.startyear + i;
// build the table structure
var table = jQuery('<table class="datepicker" cellpadding="0" cellspacing="0"></table>');
table.append('<thead></thead>');
table.append('<tfoot></tfoot>');
table.append('<tbody></tbody>');
// month select field
var monthselect = '<select name="month">';
for (var i in months) monthselect += '<option value="'+i+'">'+months[i]+'</option>';
monthselect += '</select>';
// year select field
var yearselect = '<select name="year">';
for (var i in years) yearselect += '<option>'+years[i]+'</option>';
yearselect += '</select>';
jQuery("thead",table).append('<tr class="controls"><th colspan="7"><span class="prevMonth">&laquo;</span>&nbsp;'+monthselect+yearselect+'&nbsp;<span class="nextMonth">&raquo;</span></th></tr>');
jQuery("thead",table).append('<tr class="days"><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>');
jQuery("tfoot",table).append('<tr><td colspan="2"><span class="today">hoy</span></td><td colspan="3">&nbsp;</td><td colspan="2"><span class="close">cerrar</span></td></tr>');
for (var i = 0; i < 6; i++) jQuery("tbody",table).append('<tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>');
return table;
}
/** get the real position of the input (well, anything really) **/
//http://www.quirksmode.org/js/findpos.html
function findPosition (obj) {
var curleft = curtop = 0;
if (obj.offsetParent) {
do {
curleft += obj.offsetLeft;
curtop += obj.offsetTop;
} while (obj = obj.offsetParent);
return [curleft,curtop];
} else {
return false;
}
}
/** load the initial date and handle all date-navigation **/
// initial calendar load (e is null)
// prevMonth & nextMonth buttons
// onchange for the select fields
function loadMonth (e, el, datepicker, chosendate) {
// reference our years for the nextMonth and prevMonth buttons
var mo = jQuery("select[name=month]", datepicker).get(0).selectedIndex;
var yr = jQuery("select[name=year]", datepicker).get(0).selectedIndex;
var yrs = jQuery("select[name=year] option", datepicker).get().length;
// first try to process buttons that may change the month we're on
if (e && jQuery(e.target).hasClass('prevMonth')) {
if (0 == mo && yr) {
yr -= 1; mo = 11;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = 11;
jQuery("select[name=year]", datepicker).get(0).selectedIndex = yr;
} else {
mo -= 1;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = mo;
}
} else if (e && jQuery(e.target).hasClass('nextMonth')) {
if (11 == mo && yr + 1 < yrs) {
yr += 1; mo = 0;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = 0;
jQuery("select[name=year]", datepicker).get(0).selectedIndex = yr;
} else {
mo += 1;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = mo;
}
}
// maybe hide buttons
if (0 == mo && !yr) jQuery("span.prevMonth", datepicker).hide();
else jQuery("span.prevMonth", datepicker).show();
if (yr + 1 == yrs && 11 == mo) jQuery("span.nextMonth", datepicker).hide();
else jQuery("span.nextMonth", datepicker).show();
// clear the old cells
var cells = jQuery("tbody td", datepicker).unbind().empty().removeClass('date');
// figure out what month and year to load
var m = jQuery("select[name=month]", datepicker).val();
var y = jQuery("select[name=year]", datepicker).val();
var d = new Date(y, m, 1);
var startindex = d.getDay();
var numdays = monthlengths[m];
// http://en.wikipedia.org/wiki/Leap_year
if (1 == m && ((y%4 == 0 && y%100 != 0) || y%400 == 0)) numdays = 29;
// test for end dates (instead of just a year range)
if (opts.startdate.constructor == Date) {
var startMonth = opts.startdate.getMonth();
var startDate = opts.startdate.getDate();
}
if (opts.enddate.constructor == Date) {
var endMonth = opts.enddate.getMonth();
var endDate = opts.enddate.getDate();
}
// walk through the index and populate each cell, binding events too
for (var i = 0; i < numdays; i++) {
var cell = jQuery(cells.get(i+startindex)).removeClass('chosen');
// test that the date falls within a range, if we have a range
if (
(yr || ((!startDate && !startMonth) || ((i+1 >= startDate && mo == startMonth) || mo > startMonth))) &&
(yr + 1 < yrs || ((!endDate && !endMonth) || ((i+1 <= endDate && mo == endMonth) || mo < endMonth)))) {
cell
.text(i+1)
.addClass('date')
.hover(
function () { jQuery(this).addClass('over'); },
function () { jQuery(this).removeClass('over'); })
.click(function () {
var chosenDateObj = new Date(jQuery("select[name=year]", datepicker).val(), jQuery("select[name=month]", datepicker).val(), jQuery(this).text());
closeIt(el, datepicker, chosenDateObj);
});
// highlight the previous chosen date
if (i+1 == chosendate.getDate() && m == chosendate.getMonth() && y == chosendate.getFullYear()) cell.addClass('chosen');
}
}
}
/** closes the datepicker **/
// sets the currently matched input element's value to the date, if one is available
// remove the table element from the DOM
// indicate that there is no datepicker for the currently matched input element
function closeIt (el, datepicker, dateObj) {
if (dateObj && dateObj.constructor == Date)
el.val(jQuery.fn.simpleDatepicker.formatOutput(dateObj));
datepicker.remove();
datepicker = null;
jQuery.data(el.get(0), "simpleDatepicker", { hasDatepicker : false });
}
// iterate the matched nodeset
return this.each(function() {
// functions and vars declared here are created for each matched element. so if
// your functions need to manage or access per-node state you can defined them
// here and use $this to get at the DOM element
if ( jQuery(this).is('input') && 'text' == jQuery(this).attr('type')) {
var datepicker;
jQuery.data(jQuery(this).get(0), "simpleDatepicker", { hasDatepicker : false });
// open a datepicker on the click event
jQuery(this).click(function (ev) {
var $this = jQuery(ev.target);
if (false == jQuery.data($this.get(0), "simpleDatepicker").hasDatepicker) {
// store data telling us there is already a datepicker
jQuery.data($this.get(0), "simpleDatepicker", { hasDatepicker : true });
// validate the form's initial content for a date
var initialDate = $this.val();
if (initialDate && dateRegEx.test(initialDate)) {
var chosendate = new Date(initialDate);
} else if (opts.chosendate.constructor == Date) {
var chosendate = opts.chosendate;
} else if (opts.chosendate) {
var chosendate = new Date(opts.chosendate);
} else {
var chosendate = today;
}
// insert the datepicker in the DOM
datepicker = newDatepickerHTML();
jQuery("body").prepend(datepicker);
// position the datepicker
var elPos = findPosition($this.get(0));
var x = (parseInt(opts.x) ? parseInt(opts.x) : 0) + elPos[0];
var y = (parseInt(opts.y) ? parseInt(opts.y) : 0) + elPos[1];
jQuery(datepicker).css({ position: 'absolute', left: x, top: y });
// bind events to the table controls
jQuery("span", datepicker).css("cursor","pointer");
jQuery("select", datepicker).bind('change', function () { loadMonth (null, $this, datepicker, chosendate); });
jQuery("span.prevMonth", datepicker).click(function (e) { loadMonth (e, $this, datepicker, chosendate); });
jQuery("span.nextMonth", datepicker).click(function (e) { loadMonth (e, $this, datepicker, chosendate); });
jQuery("span.today", datepicker).click(function () { closeIt($this, datepicker, new Date()); });
jQuery("span.close", datepicker).click(function () { closeIt($this, datepicker); });
// set the initial values for the month and year select fields
// and load the first month
jQuery("select[name=month]", datepicker).get(0).selectedIndex = chosendate.getMonth();
jQuery("select[name=year]", datepicker).get(0).selectedIndex = Math.max(0, chosendate.getFullYear() - opts.startyear);
loadMonth(null, $this, datepicker, chosendate);
}
});
}
});
};
// finally, I like to expose default plugin options as public so they can be manipulated. one
// way to do this is to add a property to the already-public plugin fn
jQuery.fn.simpleDatepicker.formatOutput = function (dateObj) {
return (dateObj.getMonth() + 1) + "/" + dateObj.getDate() + "/" + dateObj.getFullYear();
};
jQuery.fn.simpleDatepicker.defaults = {
// date string matching /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/
chosendate : today,
// date string matching /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/
// or four digit year
startdate : today.getFullYear(),
enddate : today.getFullYear() + 1,
// offset from the top left corner of the input element
x : 18, // must be in px
y : 18 // must be in px
};
})(jQuery);
